Netflix's biggest slump in seven years is making the mail-order and streaming movie service a 57 percent cheaper takeover target for companies from Amazon to Google.

Netflix has lost almost $9 billion in market value since July, before a price increase and the rebranding of its DVD-by-mail service as Qwikster alienated customers and drove away investors. The drop accelerated in the past two weeks, with a 38 percent tumble over five days through Sept. 21, as the company cut its U.S. subscriber forecast and Chief Executive Officer Reed Hastings separated and renamed the DVD business.

Amazon could now pay a 50 percent premium for Netflix's streaming service and still get the entire company for 26 percent less than its value just two weeks ago, according to data compiled by Wedbush Securities and Bloomberg.